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Old 02-10-2016, 01:13 PM   #2
eschwartz
Ex-Helpdesk Junkie
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Posts: 19,421
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Join Date: Nov 2012
Location: The Beaten Path, USA, Roundworld, This Side of Infinity
Device: Kindle Touch fw5.3.7 (Wifi only)
Amazon's email-to-Kindle feature accepts either plain old MOBI or dual-MOBI.
(calibre has a MOBI Output option to use dual-MOBI, alternatively kindlegen produces dual-MOBI.)

If you send dual-MOBI, Amazon will deliver AZW3 to supported devices and fallback on MOBI for unsupported legacy devices.



This is the same mechanism they use for the storefront.
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